text: Major developments: Chinese gunpowder weaponry continues to advance with the development of one-piece cast iron cannons, accompanying carriages, and the addition of land mines, naval mines and rocket launchers. Earliest recorded instance of volley fire with gunpowder weaponry, by the Ming dynasty. The rest of the world catches up quickly and most of Eurasia acquires gunpowder weapons by the second half of the 14th century. Cannon development in Europe progresses rapidly and by 1374, cannons in Europe are able to breach a city wall for the first time. Breech loading cannons appear in Europe.